[LAU] Speakers alignment

[Dominique Michel]

Le Tue, 15 Aug 2017 22:35:41 +0200,
Jaromír Mikeš <mira.mikes at gmail.com> a écrit :

> Also there is one other problem ... when you align top speakers
> (flying) with subs (stacked) I believe 15'' from "tops" having faster
> reaction than 18''  from subs.

Or the cheap filters used to split the different frequency ranges
doesn't respect the phase of the signal. (good filters in that
regard can be very complex and expansive - it is one of the most
complicated issue in electronics) Which give what you describe here:
> And one more problem ... system I am working with having some delays
> on factory presets ... Yep they are documented in charts ...

With different speakers, what make the delay between them is phase of
the signal. That phase is not dependant of the speaker size, but of the
(lack of) de-phasing into the frequency splitter and of the mechanical
alignment of the coil of the speakers (they must be on the same vertical
plan). The difference between a 15'' and a 18'' will be the dynamic.
15'' or less will be good for funky music or jazz rock, when 15'' or
18'' will be good for rockabilly.

In outdoor conditions you can also get issues with
reflections which can give you a lot of issues like larsen, or multiple
sound paths from the speakers to the public.

Cheers,
Dominique